Your last suggestion was applied already (day one; before seeking outside help). That is my problem. Even after setting Vista as the default, it is not defaulting. I set Vista as the default. The MS XP Professional Setup appears to be ignored completely in by your VistaBootPRO (does not even appear as an option in the table of OS) but it is not being ignored by the Boot Manager (displays in the following order: Earlier Windows Version, Vista, Microsoft Windows XP Professional Setup). I even added Microsoft Windows XP Professional Setup as an option hoping that maybe just the wording would force it to be acknowledged but if only created a duplicate entry of Microsoft Windows XP Professional Setup.
The only known fix, so far, has been a manual override to select Vista. How, if it is possible, do I get VistaBootPro to acknowledge XP Professional Setup? If this is not possible, is there a way to remove it from the Boot Manager?